[JL8Jeff]

I think the P0300 is the dreaded random multiple misfire codes that the 96 likes to display. The other codes look like AIR or EVAP codes. My old 96 SS would occasionally pop up the P0300 and I replaced a lot of little things but never did find the culprit. And it was never really misfiring when it would pop up, it was running smooth. I think the 96 cars have issues with the crank sensor since it was the first year for it with OBDII. I replaced the ICM, coil, wires, a bunch of EVAP parts and it went away for a long time but the guy who bought the car said it eventually came back. You could try shimming the coil with washers to get it away from the block and the heat soak. Maybe do the wires or at least the coil wire. Teh EVAP codes you need to look into and might need some new parts like the purge solenoid.